Bug 1771891 (CVE-2019-18849)

Summary: CVE-2019-18849 tnef: security bypass in .ssh/authorized_keys file via an e-mail message
Product: [Other] Security Response Reporter: Dhananjay Arunesh <darunesh>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED UPSTREAM QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: dtimms
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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Last Closed: 2019-11-13 12:51:30 UTC Type: ---
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Bug Depends On: 1771893, 1771892    
Bug Blocks:    

Description Dhananjay Arunesh 2019-11-13 08:20:06 UTC
In tnef before 1.4.18, an attacker may be able to write to the victim's
.ssh/authorized_keys file via an e-mail message with a crafted winmail.dat
application/ms-tnef attachment, because of a heap-based buffer over-read
involving strdup.

Reference:
https://github.com/verdammelt/tnef/pull/40
https://github.com/verdammelt/tnef/compare/1.4.17...1.4.18

Comment 1 Dhananjay Arunesh 2019-11-13 08:21:10 UTC
Created tnef tracking bugs for this issue:

Affects: fedora-all [bug 1771892]

Comment 2 Dhananjay Arunesh 2019-11-13 08:21:48 UTC
Created tnef tracking bugs for this issue:

Affects: epel-all [bug 1771893]

Comment 3 Product Security DevOps Team 2019-11-13 12:51:30 UTC
This CVE Bugzilla entry is for community support informational purposes only as it does not affect a package in a commercially supported Red Hat product. Refer to the dependent bugs for status of those individual community products.